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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f653701a0b251f8ba1dc718a8aeec7a3ae21402ab3c12e0fd0045b5bfaf7e6aa' 
  AND token = 'YCo/5XGgTbjxUnz5OF7FwZ95wR9o7BUHjofsJHWCuH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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