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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1feca471562055a9b9122192d025f35c7c3ade2211ca63473a979200f1b21467' 
  AND token = 'LXqtY5PUQVhkl4B+Lxldv0k62icaLaCFO4ObZKaO3PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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