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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01e131db2f25108087cd53f8d08317eac90f3e7cf74bede27d626e0f6e79545' 
  AND token = 'qoAmAUXGepct3udz6XHO4SAaykvsvc+72dvuKB5a8iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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