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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecc9e2de35748c1fd1c2bf4b697c863de546a9d7e09cd77ee72600e2da84fea' 
  AND token = 'espyHkm2boQmdsLQK9ulQaqYACbebeKA6nGnbvuVVRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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