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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61ca15c312ad86c1bb0cb32a854add01ca7a282bc15e541f5f983388615b88c' 
  AND token = 's6gx8NJfu22tFW84iC7G9NGeIgLZSWaoT1ZdNfGiKdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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