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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72dee9fa237a55f2405aaca574580943b39362736952fb10b2cd4596dc0b6fe' 
  AND token = 'KIJ858v1FfMCjqKs/RCsMN1ibvrrUSRzzKqEDIde6y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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