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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72e7c8b6368c965b4c528196e86ff603abd812cf94e1c015cefa41b0223e8fd' 
  AND token = '4knB5w4ZHssBHyd3dm5V4crsdgV5Aifr38X/MD+hZwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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