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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc06c2468a1df8410f20c5c2c9e495ba90d24b661616c2c0937019810ec7a64e' 
  AND token = '+bSgHKJOUgXXduO7VowC5z2bQu7h1PIVhDDy3hUWKLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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