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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9006f5c8d5ad48cbd650f7e01fed642f0fc57e67e3176b5e105b26f694da7618' 
  AND token = 'KFokV4Y+FEKp2f43BMJJQGXxPX72rUQCCzGo6Z4rk30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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