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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67893d6a85946eaa57ef240a54cc40b348bda016204adb13087a8d6da80d826a' 
  AND token = 'Wc3BVUu+IWT2m3s9YSNAeu93WkaMwM07XAEwmemmyYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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