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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22ea20bb9bf9300051b7eded2950522b0d3f7daca5efc47f3fa42da9d1712b42' 
  AND token = 'yMQ446F6R/hdOdAoY8UF1G2EgCx3hFsOt59gMEZIiSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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