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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d6c30fd9bd814b26f6a8ac77c8b2632784cc8eb9010f73c919c149396d1079' 
  AND token = 'S0lWvLvpOWzNxd8C8UhnY2w0mdtenE1HbHMcF84tfW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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