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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524e0bd7d809b34cc7dc59652a4ebe596e50272fbed1f98f7372784c4c3dc840' 
  AND token = 'uVFcHmD2UsUeMEsZBnldBWtJJAUTZuU7o5HJGqhrK5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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