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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8196f169f83fb7943ac4f8cc426e683ea9d593c3230c0fb0fd896b08322d3fd' 
  AND token = 'CFAjmFNs58WO5VKYQL7eAisn3sMmDHQF8OS7CzguNiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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