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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31980fe9e40405c32575c90921c6c33078956894c7be8f8bf9b2233b0aa01f83' 
  AND token = 'CfeYFIqLnzVHDohNBr3iaoK6GZd9ACiEM559W8au2nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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