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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bba589617b6cf09586e09e7d07fde34a28e22a0093981cb4abb599c7d9026b0' 
  AND token = 'E5hA542Q27cwA5yKlv9QRoQsbMBPdCEeScz9/nOpL1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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