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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c0a485a6963bf4dec8cd70a00f71c51527b3d821e939e6766d36f719473d0c' 
  AND token = 'q1v+ZaoD46VLabrEtBCDG1uTCh61loWxTIfUSWBP1ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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