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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030eab41fec3f32f9513a99f1181b055a074eedfa4b8d649580696a9d3c50bd3' 
  AND token = 'PGXpN2LEBr7Ow2AxXlzTMqDLdjG4CWXEv7OeJvj5ZPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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