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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e31a9b767748163734ebb151ec532b19006b8751c309f48e79171894c3e56d' 
  AND token = 'Y9Omb8VhkZYdR6G6p8V5YrjpDhemrKDFIspleplUqKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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