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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92b8a11710810b7968c669f494064b5520cd04e7eb80b0662bd4d2464d0a6b2' 
  AND token = '4ACwmu2wGDdD+ILwC1BqSoynUXKM0u4PUJWBP9qJtc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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