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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5bac9e83100ec673dc3fc9afa3ab0030d2c458e75397555a7c9a7a1bbe304c' 
  AND token = 'GWL8Uf0P90Ri263EHPwcKz6v/VF5U261TBP+xCOvMl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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