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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c632bec97c2ba46fda40cf1fe492c6487daa29bfdfc04c688142c976d44a3c23' 
  AND token = 'EcSzrxJaB7O924eM0RFPJKxF8z07IN7KR9or7SVaJxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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