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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47551e98f90d7d293e3f114f923adfd90f46a45fcba1cbee84fdcea23588a4a1' 
  AND token = 'aX6i+CDN6nyGSDGLedc3eUgm6RneUL4eEzjzx7gcqVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}