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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaa3a5767393c8907d62bd141433e09d5743c1ba43a54f2e5c178ef25eec4df' 
  AND token = 'a3jJFMl8yXDI86V7sg8elXoAgIT0AJluy6Top3FQlUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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