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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdfed60cdead6ae70aa4a5a895177c82314d0f5149e1a58ee4b76aa951cebf9' 
  AND token = 'QeE1VdXXeo6WSSqJT7DAy+972LNEcpKg4N7uWCGBluo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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