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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36d47fafd6a590cab29ce7db1f2a170e021ea4f316447a9da06ba0aaf134562' 
  AND token = '/eEODDylAyYoYjh3NKq6aUgy5+FaXmHGQcJhPiPh9nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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