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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ac305a1632770a3dcb0c34c3f89d4130327d4c0e5d2a56c1e485bd18df56c3' 
  AND token = 'B9QmYr36MEcJK8HAYCo3v+FG6Jz6eyZaKF5FSZoAfUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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