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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fc7cf82919e3721f44eeecaa302c563429b35273e7de14374ecec2bb709d3e' 
  AND token = '962VlAZVQL+SEg8GdqR188RU54nNIYu62ogUZRJvgTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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