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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdb94f6a9a8aac5db17624584efef582ed57468fc10f099f355442a8394e91a' 
  AND token = '2PzfL1ZG1Yvi4oJAi2xU4n5YeT1DpHo7c/Kt0WLh6fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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