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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6634e1e0f8739fd6bf6562235e24d607853d5a67d5d6b1b032cf8c6fa66dc4' 
  AND token = 'SlYeuXyQ1hqSdv5DlMvbaoSUCGx3+EeBnSC52yc8CjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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