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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9d31e696f0dd158cab36a9560474f21e9b12136abea1f39cfd502d69853304' 
  AND token = 'E2krY1zTlAdXKhBfer2tcH5OYv/lsEn77WvAJc7ez6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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