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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0c086d87790868660fde2d60d267138a0aed6ea1deda333f31f2f4768ecf55' 
  AND token = 'mIkp1P+s+KTW8s9MiZI2claWp3q3UZjV4s5ujOw7GTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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