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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ea432fc5f7554a7e3ae969f5602e75b4d0923653fe799fc38e0e25c4d4a776' 
  AND token = '6GL18Z0wwoK6vro1sWDNwmDmys9TCKWcXr6rQDEM1/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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