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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2841c38bae185dba866b0d785a2e3e47ab315acb513c112e12012eb6fb6c53c1' 
  AND token = 'JiD9NhB/JU6oYzwPjZzw7W+CwLeMYAieA5qsAfner1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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