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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7183ad2d7dac4fa11dc9a6154466450b059c7b1b687a86edf8b26c2e4e1ff856' 
  AND token = '7yr0SheCqf4RPhraLv8qru/l+ppj0bMWwjE7OJszz2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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