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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32eb5f2c87de2e38cf0ff20d7a39a7225988a8d3a27eff4a9619da5e61a6dc7' 
  AND token = 'uAJKIhs6WxpnWPUhdsuzr9fCj+zRKjN2SJi3KLurwac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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