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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79823eb17df24cfb89d9658f18e2a15184bf8fdf9b51a3074068b70a0755eb80' 
  AND token = 'L6h+7CovcveoX5HWAQWU1lAVDUWN7Vbm0iqdte0se98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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