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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592e6b61247f545f37c3810484fac6bdb8fcecc1efb3d74fa497184b213fdd6c' 
  AND token = '8g1BOcdZoT6JwQ9yhmCXa/CfQO5yiOfpvQVfhSw1pEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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