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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd63e9ec5636e7a427ad284bfc695646e6ce9f1f0e88546861ae0fe1c24eefce' 
  AND token = 'fCft4vsQmjf7RXd+9qxJNz5qvBAzhgCudeOdX7R/wj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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