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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0d2be41a46db1f5c6d568cea4edbe8f4ead2d1b99d666387e3061b00bcdeec' 
  AND token = '6QWvTH/9ivNTe3NPp1C/LOwh2Xffq5lTv32BcDYv4sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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