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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79472c8f6a38a3cc9260f38504a2eb001d2af54b5fd0a8120822854ca2c02565' 
  AND token = '8REePs4YeQSnN2Ox3g0a0MCsCWoSNQwtqztjZILU5wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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