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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a27adebcfc7b3c0830161768703ab5df870e7cf0bacd8fb89a8eaa398f31285' 
  AND token = '08xMlUw4VsrULhi6E1IQU+IfF9qEWTnmWZEJBZuaMPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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