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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751284cee6a52091ef3467c89f5789472ad4bbc3a84aee3ddf77971d63ea15ad' 
  AND token = 'SlwiM8Da6y9wCjAXQ35jhfYzG1HcZULj6D6qR+meNZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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