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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ada65ce299ebf0f252dcac3c43f26e585d9fd4046000b75c9c4e4d67b20ced' 
  AND token = 'lDS5qqdqR+lFF+vaSIvLuGUHYh8SIfGFpnvJT3ONPUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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