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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b474a96680490d73d898e07171225d418a826b45d92d6c286b6ec8ee827f8020' 
  AND token = 'r+AKwAWzI1dtNBdGDrrpP2EmK6VSq3PSD4lMDNaYtOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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