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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85185447fdc09fcd16c78ffe1b2cd16c366fb2ac22fe4612e21f13444b328f8d' 
  AND token = 'QGteLoyr+KsSyqdWKXIU94F+XrDwEce9Zd0o+A12pBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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