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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbca33bdc6e1d63576f4d4a9173b3a8257a7d67a83fd3f397b0f4e05c93eef9' 
  AND token = 'enEyuGV5DqhzCfym5ZpwRbte0Z6X0/KrfniG8h7mWhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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