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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9d5861cc5ac47690407a66f24686f84467387810a3c61e1930502a3aba52a3' 
  AND token = 'vLAh7A5Fnm9PsGTgRFLyCN8xQyKqWgdG62g472b5uIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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