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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e3c0ffd2fb5aed8264522dca79c70b1d713349ec399aeef585f8da7fd10409' 
  AND token = '8KN8U/g8D5UmR/ZH3yz33L342p9RwsuRa3ONAu/idSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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