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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5698459ab3ba609ba9a15eb5cd23c46101abea0a9c3b160927d41193da2d3ab7' 
  AND token = 'M+k6aAFGEsQWJOhC9cz0vwJLz10YLx1MJX5jG2GB/hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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