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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b046b1fb4acc7afb2cce1a22918cef14af65b9e5e268169ada8ef7e848b9d8e3' 
  AND token = 'wVqwm6W4We85RiVxMkB8Ae87QKdaGIfsfX/+MpJ8jgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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